Busbar base



FIG. 1 is an isometric view of the busbar base showing my new design;

FIG. 2 is a bottom perspective view therof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a side view thereof, the other side a mirror image; and,

FIG. 6 is an end view thereof, the other end a mirror image. 

CLAIM The ornamental design for a busbar base, as shown and described. 